#3757AD
Closest named color: Denim Blue (#3B5B92). oklch(48% 0.142 265.9), rgb(55, 87, 173).
Aa
White text reads best on this color (6.71:1).
About this color
#3757AD is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.142 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.047 away. White text reads best on it, at 6.71:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.12:1 |
| White text | 6.71:1 |
Values
| HEX | #3757AD |
| RGB | rgb(55, 87, 173) |
| HSL | hsl(224, 52%, 45%) |
| OKLCH | oklch(48% 0.142 265.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3757AD | 6.71:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #3757AD | 3.12:1 | AA large text | Lc 21.3 | Dividers and decoration only |
| #3757AD text on white | 6.71:1 | AA | Lc 82.8 | Fine for body text |
| #3757AD text on black | 3.12:1 | AA large text | Lc -19.1 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ACC0EE
oklch(80.9% 0.069 266.5)
-
Step 400
400
#809FE6
oklch(70.8% 0.11 265.7)
-
Step 500
500
#6185DE
oklch(63.1% 0.14 265.9)
-
Step 600
600
#486DCC
oklch(55.6% 0.153 265.7)
-
Step 700
700 (this color)
#3757AD
oklch(48% 0.142 265.9)
-
Step 800
800
#304A8F
oklch(42.7% 0.118 266)
-
Step 900
900
#2A3F72
oklch(37.8% 0.091 265.4)
-
Step 950
950
#192543
oklch(27% 0.058 266.1)
#3757AD with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #2761B0 | 0.028 |
| Deuteranopia (no green cones) | #0357AB | 0.033 |
| Tritanopia (no blue cones) | #006B7A | 0.116 |
| Achromatopsia (no color) | #5C5C5C | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3757AD
#3757AD
oklch(48% 0.142 265.9)
- #765900
#765900
oklch(48.1% 0.098 86.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3757AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.051
- Dusky Blue #475F94 ΔE 0.053
- Dusk Blue #26538D ΔE 0.056
- French Blue #436BAD ΔE 0.059
- Twilight #4E518B ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.064
- Blueberry #464196 ΔE 0.065
Use #3757AD in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.